本文研究了自适应正交多载波频分复用（AOFDM）中根据估计出的信道特性选择调制方式的问题。
The problem of how to choose the constellation size based on the estimated channel qualities in AOFDM systems is addressed in this paper.
正交频分复用调制（OFDM）是一种信道利用率很高的调制方式，具有良好的抗衰落能力，可实现并行传送。
OFDM is a modulation method which was often used in the channels. It has better capability against the fading and can realized parallel transmission.
提出利用正交频分复用(OFDM)多载波调制方式代替单载波调制方式对信息进行处理。
The OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier modulation is used to process messages instead of the traditional single carrier modulation.
在高速实时的光交换系统中有时分、空分和频分主三种交换方式。
Three different architectures (time, space and frequency-division) are used in high speed and real time switching systems.
调制方式和多址接入的灵活性是正交频分复用（OFDM）技术的一大优点。
One of the advantages of OFDM is the flexibility concerning modulation and multiple access techniques.
在DVB系统中卫星传输采用QPSK，有线传输采用QAM方式，地面传输采用COFDM(编码正交频分复用)方式。
In DVB satellite transmission system used QPSK, using QAM cable transmission, terrestrial transmission using COFDM (coded orthogonal frequency division multiplexing) way.
提出了OFDM(正交频分复用)利用FFT(傅里叶变换)实时同步方式的方案，在多径环境下具有有良好的特性。
This paper proposes a scheme for temporary time locking by using FFT (fast Fourier transformer) in OFDM (orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.
提出了OFDM(正交频分复用)利用FFT(傅里叶变换)实时同步方式的方案，在多径环境下具有有良好的特性。
This paper proposes a scheme for temporary time locking by using FFT (fast Fourier transformer) in OFDM (orthogonal frequency division multiplexing). The OFDM has a good BER in multipath.
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